to understand the problem is very difficult .(改同义句)( )( )very difficult ( )understand the problem

问题描述:

to understand the problem is very difficult .(改同义句)
( )( )very difficult ( )understand the problem

It is very difficult to understand the problem. 此处it 为形式主语,实际主语则为后面的不定式结构(to understand the problem.) 英语中会经常出现这样形式主语的结构,避免了句子给人头重脚轻的感觉。

it is very difficult to undersdtand the problem
欢迎追问哦

It is to